Memory Blue | Memory Blue

It's been 4 years since the protagonist, Kururugi Subaru, started working at a fashion company after graduating from university. Together with his classmate, Andou Keita, and his kouhai, Shitou Sae, they opened a startup-like in-house image brand, with Subaru as the project leader.

While he was devoting himself to the project, a woman who had recently completed her training, Aoi Seina, was assigned to the project as a newcomer. Subaru fell in love with her at first sight. However, he didn't want to bring his personal feelings into his work. In the end, he devoted himself to taking care of her as her senpai. Nearly a year had passed, and then one day, Subaru confessed his feelings to Seina, and she accepted. Afterwards, they got married.

On one such day, Seina received an invitation to her class reunion​. She wasn't very enthusiastic to attend, but after her husband's encouragement, decided to go to the reunion.

At work, Keita jokingly teased Subaru, "Wouldn't it be terrible if she stay there with her ex-boyfriend?" Although he laughed it off at the time, Subaru became anxious​ when he was alone.​

A few days later, Seina returned home with a souvenir, but besides that, there wasn't any particular changes in her appearance. After a while, he noticed that his wife's behavior was a little strange, as if she was worried about something...